I have a bulk of Apple Music audio tracks on my iTunes, but my mom wasn't use the Apple Music, some of them is my mom's. I want to copy them to my mom, how can I convert Apple Music to MP3? Help me out of this problem!!!!!

Well, it seems just convert MP3 to different kinds of music formats.
As it said that DRM protected audio is not supported and cannot be converted because of the App Store policies.
Whatever, thx for answering my question! ^.^